Interlocking mechanism for elevators.



1. s. MUCKLE & T. H. STRALEY.

INTERLOCKING MECHANISM FOR ELEVATORS.

APPLICATlON FILED DEC. 5. l9l3.

Patented Mar. 14, 1916.

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THE COLUMBIA PLANOGRAPH c0" WASHINGTON. n. c.

1. s. MucKLE' & T. H. STRALEY.

INTERLOCKING MECHANISM FOR ELEVATORS.

APPLICATION FILED DEC. 5.1913.

1,175,?9. Patented Mar. 14,1916.

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'UNKE STAT onion.

JOHN S. MUCKLE AND THOMAS H. STRALEY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO STANDARD ELEVATOR INTERLOCK COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

INTERLOCKING MECHANISM FOR ELEVATORS.

Application filed December 5, 1913.

To all whom it may concern:

Be it known that we, JOHN S. MUcKLn and THOMAS H. STRALEY, citizens of the United States, residing in Philadelphia, county of Philadelphia, State of Pennsylvania, have invented certain Improvements in Interlocking Mechanism for Elevators, of which the following is a specification.

Our invention relates to certain improvements in interlocking mechanism for elevators which prevents the door from being opened when a car is not at a landing, and also prevents the movement of a carai-ter it has been brought to a stop at a landing and the door has been opened.

The invention is particularly adapted forv use in connection with elevators of the type in which an operating cable extends through the car and an operator grasps the cable to actuate the mechanism for starting and stop- .ping the car, in contradistinction to an operating device consisting of an operating wheel or lever.

One object of our invention is to provide means for limiting the movement of the ca ble when the door has been opened, and to permit of the free movement of the cable when the door is closed.

A further object of the invention is to construct the mechanism so that it will act upon the return run of the cable.

In the accompanying drawings :F igure 1, is a sectional view showing the door closed and the mechanism shifted to allow the op erating cable to have a free movement; Fig. 2, is a similar view, showing the door partly open and the mechanism shifted so as to interfere with the free movement of the operating cable; Fig. 3, is a sectional View through the car and part of the elevator well on the line a-a, Fig. 1; Fig. i, is a sectional view on the line bb, Fig. 1; Fig. 5, is a sectional View on the line cc, Fig. 1; Fig. 6, is a sectional view on the line o'0, Fig. 2; Fig. 7, is a sectional view on the line cZ -cl, Fig. 5; Fig. 8, is a sectional view showing the latch for the door; Fig. 9, is a front view of said latch; and Fig. 10, is a view of a modification.

Referring to the drawings, 1, 1 are the walls of the elevator well of the ordinary construction. 2 is one of the platforms.

Specification of Letters Patent.

Patented Mar. 14, 1916.

Serial No. 804,790.

3 is the platform door, which is a laterally sl1ding one in the present instance, but

it will be understood that it may be a door arranged to slide vertically without departing from the essential features of the invention.

1 is the car having a floor 5, as shown in Fig. 3.

6 is the operating cable, one run of which passes through the car while the return run, as shown in Fig. 1, is located in the space between the car and the wall of the elevator shaft. The operator stands in the car and grasps the cable so as to shift the mechanism controlling the movement of the car.

Depending from the forward end of the door 3 is an arm 7 having a notched extension 8, which is engaged by the latch 9 pivoted at 10 to the plate 11, which is secured to the wall of the elevator well. A spring 13 on the latch bears against the plate and forces the latch out against a stop band 14;, as clearly shown in Figs. 8 and 9. When the latch 9 engages the extension 8, the door is locked in the closed position. This latch can be released by a foot pin 15 in the floor of the car which actuates a bell crank lever 16 pivoted at 17 and connected by a rod 18 to an arm 19 having a roller 20, which bears against the latch 9. A spring withdraws the arm 19 out of contact with the latch as soon as the foot is taken off the pin 15.

In the present instance, secured to the wall of the elevator well, directly under the door opening, is a sliding bolt 22. This bolt has a head 23, which is engaged by the arm 7 when the door is closed, but, when the door is open, the arm is withdrawn from the bolt and the bolt is free to move independently of the door.

24 is a bearing secured to the wall of the elevator well, as shown in Figs. 1, 2 and 6, and this hearing has a guideway for a sliding plate 25 made as shown in Figs. 5, 6 and 7. This plate has two arms 27, in the present instance, and on each arm is a spring 28 confined between a pin on the arm and the bearing, so that the tendency of the sliding plate is to move away from the bolt.

On the return run of the operating cable stops 29 and 29 are mounted and the passage 30 in the bearing 24 is of such a size plate is formed, in the present instance, by

spacing the arms 27 a suflicient distance apart to make the openlng the same size as the opening in the bearing, in order to allow a clear passage through the bearing when the parts are in the position illustrated in Figs. 1 and 5, but, when the door is opened and the bolt is released, the springs 28 move the plate to such a position that it reduces the opening. A stop 33 limits the movement of the plate, so that while the opening will be greater in diameter than the cable, it will be less than the stops 29 and 29 and if the cable is moved, said stops will come in contact with the plate. This movement, however, is not sufficient to shift the mechanism for starting the car, consequently, the car cannot be accidentally raised or lowered until the door is closed andthe' opening in the plate is enlarged to allow one of the stops to pass. Thus it will be seen by the above construction that the door is locked when'the elevator is at a landing, as it is held-by the latch v9 and the latch cannot be operated until the car is at a landing, as the mechanism for actuating the latch is carried by the car.

l/Vhena car is at a landing and the door has been opened by pressing the foot on the foot pin 15, the sliding plate is released from the control of the door and its springs will shift it so; as to reduce the passage in the bearing 24, and while the cable is free to move through the opening one of the stops on the cable will come in contact with the plate and will prevent further movement of the cable, consequently, the mechanism for starting the car cannot be actuated.

In Fig. 10, we have illustrated a modification in which the bolt 22 is dispensed with and the chain 31 is connected directly tothe arm 7 on' the door 3, but we prefer to use the construction illustrated in Flg. 1, as it makes the cable mechanism entirely independent of the door. The peculiar form of door latch and the mechanism on the car for actuating the latch may be modified without departing from the spirit of the invention.

WVe claim 1. The combination with an elevator car adapted to an elevator well, of a platform, a sliding door arranged to close the opening leading from the platform to the well, a

cable having its return run extending between the car and the 'wall of the elevator well, stops on said cable, an arm on the door, a bolt on the wall of the elevator well adjacent each landing and in the path of said arm, a bearing mounted adjacent each landing on the wall of theelevator well and having an opening for the passage therethrough of said return run of the cable, a horizontal forked plate slidably mounted in said bearing, a spring for moving the plate-in one direction, and a chain connect ing the plate with the bolt and of such a length that the plate will be shifted to open the passage in the bearing when the arm on the doorengages the bolt when in its closed position, so that when the door is venting the movement of the cable vof an elevator when the car is at a landing and the door is open, consisting of a bearing,

arranged to be secured to the wall of the elevator well and having a vertical passage therethrough; a forked sliding plate mounted in the bearing; a. spring on the fork of the plate to move it in one direction; and means for moving it in the-opposite direction, the plate being arranged to regulate the size of the passage through the bearing.

In testimony whereof, we have signed our names to this specification, of two subscribing witnesses. 1

JOHN S. MUCKLE.v THOMAS H. STRALEY. Witnesses:

Jos. H. K EIN, WM. A. BARR.

I 1n the presence Copies of this patentmay be obtained for five cents each, by addressing the Commissioner of Patents,

7 Washington, D. G. 

